7-Dehydrocholesterol
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| Post Date: | Feb 02,2016 |
| Expiry Date: | Jul 31,2016 |
| Detailed Description: |
Cas No. :434-16-2
Payment Method: money gram, western union, bank transfer, bit Synonyms: (3)-7-Dehydrochlesterol;(3beta)-Cholesta-5,7-dien-3-ol;(3-beta)-cholesta-7-dien-3-ol;(3beta)-cholesta-7-dien-3-ol;3-Hydroxycholesta-5,7-diene;5,7-Cholestandien-3.beta.-ol;5,7-Cholestandien-3beta-ol;7,8-Didehydrocholesterol Product Details: Place of Origin: China Certification: ISO9001 Brand:YuanCheng Payment & Shipping Terms: Minimum Order Quantity:1kg Supply Ability:500kg/month Delivery Time:within 24 hours after payment Payment Terms:Western Union, MoneyGram, T/T Appeatance:white to off-white fine crystalline powder Package:25kg/bucket Purity:95% Product Description: CAS: 434-16-2 MF: C27H44O MW: 384.64 EINECS: 207-100-5 7-Dehydrocholesterol is a zoosterol that functions in the serum as a cholesterol precursor, and is converted to vitamin D3 in the skin, therefore functioning as provitamin-D3. The presence of this compound in human skin enables humans to manufacture vitamin D3 from ultra-violet rays in the sun light, via an intermediate isomer pre-vitamin D3. It is also found in the milk of several mammalian species. In insects it is a precursor for the hormone ecdysone, required for reaching adulthood.It was discovered by Nobel-laureate organic chemist Adolf Windaus Synthesis of pre-vitamin D3 in the skin involves UVB radiation which effectively penetrates only the epidermal layers of skin. 7-Dehydrocholesterol absorbs UV light most effectively at wavelengths between 290-320nm and thus the production of vitamin D3 will only occur at those wavelengths. The two most important factors that govern the generation of pre-vitamin D3 are the quantity (intensity) and quality (appropriate wavelength) of the UVB irradiation reaching the 7-dehydrocholesterol deep in the stratum basale and stratum spinosum.[4] Another important consideration is the quantity of 7-dehydrocholesterol present in the skin. Under normal circumstances, ample quantities of 7-dehydrocholesterol (about 25-50 mg/cm2 of skin) are available in the stratum spinosum and stratum basale of human skin to meet the body's vitamin D requirements. Usage: 1. Important intermediate in the synthesis of vitamin D3 2. Skin sunscreen additive in cosmetics 3. Other laboratory reagents |
| CAS Registry Number: | 434-16-2 |
| Synonyms: | ;Provitamine;7,8-didehydrocholesterol;cholesta-5,7-dien-3-beta-ol;Provitamin D3;cholesta-5,7-dien-3-ol;(3beta)-cholesta-5,7-dien-3-ol; |
| Molecular Formula: | C27H44O |
| Molecular Weight: | 384.6377 |
| Molecular Structure: | 
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| Safety Description: | S24/25:; |
| Company: | Zhuzhou Yuancheng Hezhong Technology Development [ China ] |
| Contact: | kathyyan |
| Tel: | 86-731-22292056 |
| Fax: | 86-731-22292056 |
| Email: | mxy044@yccreate.com |
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